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ECP2 Datasheet(PDF) 94 Page - Lattice Semiconductor |
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ECP2 Datasheet(HTML) 94 Page - Lattice Semiconductor |
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94 / 386 page  3-42 DC and Switching Characteristics Lattice Semiconductor LatticeECP2/M Family Data Sheet PCI Express Electrical and Timing Characteristics AC and DC Characteristics Table 3-15. Transmit 1, 2 Table 3-16. Receive Symbol Description Test Conditions Min Typ Max Units UI Unit interval 399.88 400 400.12 ps VTX-DIFF_P-P Differential peak-to-peak output voltage 0.8 1.0 1.2 V VTX-DE-RATIO De-emphasis differential output voltage ratio 0 -3.5 -7.96 dB VTX-CM-AC_P RMS AC peak common-mode out- put voltage —20— mV VTX-CM-DC-LINE-DELTA Maximum Common mode voltage delta between n and p channels — — 25 mV VTX-DC-CM Tx DC common mode voltage 0 — VCCOB + 5% V ITX-SHORT Output short circuit current VTX-D+=0.0V VTX-D-=0.0V — — 90 mA ZTX-DIFF-DC Differential output impedance 80 100 120 Ohms TTX-RISE Tx output rise time 20 to 80% 0.125 — — UI TTX-FALL Tx output fall time 20 to 80% 0.125 — — UI LTX-SKEW Lane-to-lane static output skew for all lanes in port/link — — 1.3 ns TTX-EYE Transmitter eye width 0.75 — — UI TTX-EYE-MEDIAN-TO-MAX-JITTER 3 — — 0.125 UI CTX AC coupling capacitor 75 — 200 nF 1. Values are measured at 2.5 Gbps. 2. Compliant to PCI Express v1.1. 3. Measured at 60ps with plug-in board and jitter due to socket removed. Symbol Description Test Conditions Min. Typ. Max. Units UI Unit Interval 399.88 400 400.12 ps VRX-DIFF_P-P Differential peak-to-peak input voltage 0.175 — — V VRX-IDLE-DET-DIFF_P-P Idle detect threshold voltage 65 — 175 mV ZRX-DIFF-DC DC differential input impedance 80 100 120 Ohms ZRX-DC DC input impedance 40 50 60 Ohms ZRX-HIGH-IMP-DC 1 Power-down DC input impedance 200K — — Ohms TRX-EYE Receiver eye width 0.4 — — UI TRX-EYE-MEDIAN-TO-MAX-JITTER — — 0.3 UI Notes: 1. Measured with external AC-coupling on the receiver 2. Values are measured at 2.5 Gbps |
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